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a. 25 x 7 = 175
2. keliling = 2p + 2l
2l = 80 - 50
l = 15 cm
3. keliling = 2x5 + 2x10 + 2x8 = 46
1. keliling = panjang sisi x jumlah sisinya = 40cm
panjang diagonal = a√2 = 10√2
K = 4 (10) = 40 cm
Panjang diagonal AC=?
AC² = s² + s²
AC² = 10² + 10²
AC² = 100 + 100
AC² = 200
AC = √200
AC = √4×√25×√2
AC = 2×5×√2
AC = 10√2
2) K = 80 cm
p = 25 cm
l = ?
K = 2 (p + l)
80 = 2 (25 + l)
80 = 50 + 2l
80 - 50 = 2l
30 = 2l
15 = l
jadi lebar persegi panjang tsb 15 cm
3) EB = 5 cm
BC = 8 cm
CD = 10 cm
K = ?
K =DA + AB + CB + CD
= 8 +(10+5 + 5) + 8 +10
= 8 + 20 + 18
= 46 cm
4) a) L. jajargenjang = a×t = 25× 7 = 175 cm²
b) Lampiran
NB :) 4b masih kurang besok saya lanjutin XD